Interlocking door and elevator mechanism



W- 9, 193& H. c. WALDMAN 2,126,066

INTERLOUKING DOOR AND ELEVATOR MECHANISM Filed June 17, 1935 3 Sheets-Sheet 1 mnunnuunnuuum LM INVENTOR.

ATTORNEY.

N A M b L A w a H INTERLOCKING DOOR AND ELEVATOR MECHANISM s sheep's-she t 2 Filed June 17, 1935 INVENTOR.

w-mcw an, ATTORNEY.

Aug. Q, 1938. H. c. WALDMAN 23,126,066

INTERLOCKING DOQR AND ELEVATOR MECHANISM Filed June 1'7, 1935 3 Sheets-Shet 5 l l l l I 1 l l l l l INVENTOR.

ATTORNEY;

Patented Aug. 9, 1938 UNITED STATS PATENT E'FlfiE INTERLOCKING DOOR AND ELEVATOR MECHANISM 16 Claims.

This invention relates generally to elevator door structures and has more particular reference to interlocking door and elevator mechanism adapted especially, though not exclusively, for use in connection with electrically operated elevators.

My invention has for its prime object the provision of an interlocking door and elevator mechanism which will permit operation of the. elevator car only when the door is latched in closed position and will permit opening of the door only when the car is at the landing which the door protects.

My invention has for another object the provision of mechanism of the kind stated which will be positive in operation, may be accurately adjusted for efficient performance of its protective functions, and which completely protects the public against the hazards of improper elevator door operation.

And with the above and other objects in view, my invention resides in the novel features of form, construction, arrangement, and combination of parts presently described and pointed out in the claims.

In the accompanying drawings (three sheets)- Figure 1 is an elevational view of an elevator door and interlock construction of my invention as seen from the well of the elevator, portions of the door-guide structure being broken away;

Figure 2 is an enlarged fragmentary view of the interlock construction in normal door-locking position;

Figure 3 is a view similar to'Figure 2, showing the interlock in door-released position and the door opened;

Figure 4 is an enlarged fragmentary view of the door-latches and interlock, illustrating the coordination of the several parts when the door is locked in closed position;

Figure 5 is an enlarged detail view of the baseplate of the door guide-shoe;

Figure 6 is an enlarged detail view of the shoeplate of the door guide-shoe;

Figure '7 is a fragmentary side View of a door guide-shoe mounted on the door, portions of the guide being shown by dotted lines;

Figure 8 is an end View of a door guide-shoe;

Figure 9 is a fragmentary sectional plan view of an elevator in its well and my improved door and interlock construction;

Figure 10 is a fragmentary sectional view of the interlock construction taken approximately along the line Ill-Ill, Figure 9; and

Figure 11 is a fragmentary sectional view of the interference bar construction taken approximately along the line I l-| I, Figure 9.

Referring now more in detail and by reference characters to the drawings, which illustrate. a preferred embodiment of the invention, l designates an elevator car, 2 the well in which the car I is arranged for travel, 3 a floor-landing of the well, and 4 the access-opening at the landing 3 through the elevator-well casing or wall 5, all of conventional construction, as diagrammatically shown in Figure 9. v

Suitably mounted on the well side of the wall 5, is a pair of vertically disposed angle-members M, each having one leg m presented inwardly of the Well 2, and riveted, welded, or otherwise fixed to said angle-legs, are door guides A, A, which extend vertically both above and below the opening 4 adjacent the respective side margins thereof, the guides A, A, preferably, though not necessarily, comprising metallic angle members each having one leg 6 suitably spaced from the other leg m of angles M and presented toward the opening 4 and the other leg 1 presented inwardly of the well 2.

Mounted for vertical movement in opposed relation between the guides A, A, is a pair of upper and lower door sections B, B, respectively, which are mutually approachable for closing or obstructing the landing opening 4. The doors B, B, are flexibly connected in counterbalanced relationship by means of respective side chains 8 connected to brackets 9 mounted on the lower side corners of the upper door B, which chains 8 pass upwardly and over sheaves l0 suitably mounted in brackets II on the respective angles M, and thence downwardly for engaging respective hanger-rods l2, l3, adjustably upstanding from respective brackets 14 laterally outstanding from the respective upper side corners of the lower door B, as best seen in Figure 1.

Each door section B, B, is equipped at its respective side margins with a pair of vertically spaced guide shoes C of unique utility and function, as will presently more particularly appear, which slidingly engage the respective guides A, A, for guiding the doors B, B, in their vertical movement therebetween.

Each shoe C comprises a side wall or plate l5 of substantially rectangular contour, equipped with a pair of vertically spaced laterally extending ears or lugs it for attachment of the plate I5 to the adjacent side margin of the door B or B, the shoe wall or plate l5 projecting from the doorsection between the leg m of the angle M and the adjacent approximately parallel leg 6 of the guide A or A, as best seen in Figure 9.

On its inner side face, that is to say, its side face opposite the guide leg 6, the plate I5 is provided with a centrally disposed rib H, which, as best seen in Figure 5, has an arcuate face for slidably engaging the adjacent side face of the guide-leg 6 with minimum friction.

Opposing the other side face of the guide-leg 6 and forming part of the shoe C, is a wall or plate 58 also of substantially rectangularcontour and likewise having a centrally disposed rib l9 similarly having an arcuate face for slidably engaging the guideleg 5, the walls or plates 15, I8, thus embracing the guide-leg B for, in cooperation therewith, guidingly restraining the door B or B against inward or outward departure from its desired vertical plane of movement. 7

Also, each plate !8 is equipped with a laterally disposed shoulder 20, which is continued endwise outwardly beyond the side margins of the plate [8 by respective suitably curved and tapered horns 28, the shoulder 2 opposing the edge margin of the guide-leg 6 for co--o perably guidingly restraining the door B or B against lateral or sidewise departure from its desired vertical path of movement.

The shoe-plate I8 is adjustably connected to the plate 55 and, for such purpose, is provided with an elongated slot or aperture 22, through which is disposed a suitable fastening element preferably in the form of a bolt 23 threaded, in turn, into a registering pad or embossment 24 provided on the base-plate l5, whereby the shoulder may be projected more or less from the door margin for, in such manner, adjusting the spacing of the door relatively to the guide-leg 6, the door B or B being most precisely and exactly positioned or aligned in its spaced relationship with and between the guides A, A, by means of respective set-screws or the like 26 adjustably threaded through ears projecting laterally outwardly from the outer face of the plate l8 for endwise impingement upon suitably re- 3 cessed portions 2'! of the ears or lugs I6 of wall handle 3! on the respective opposite sides of its pivot bracket 30, is a pair of latch-bars 32, 33, which extend outwardly in opposite directions across the face of, and slidably through supporting brackets 34 suitably mounted on, the door B for normally projecting substantially beyond the corresponding side margins thereof, as best seen in Figures 1 and 4.

One of the latch-bars, as 33, is provided with an angular lug 35, through which is adjustably threaded an eye-bolt 36, and a tensional memher or spring 3'! is engaged between the eye of the bolt 36 and the adjacent bracket 34 for yieldingly biasing the latch-bars 32, 33, in extended position for projecting substantially beyond the side margins of the door-section B.

And, in order that the projection of the latchbars 32, 33, may, for purposes presently more particularly appearing, be precisely controlled and determined, the latch-bar 33 also carries an angular lug or stop 38 for impinging the free end of a stop-bolt 39 adjustably threaded through a lug or bracket 40 mounted on the face-plate 2t, as best seen in Figure 4.

Normally, that is to say, when the door-sections B, B, are in substantially abutting or closed position for obstructing the landing-opening 4, the latch-bars 132, 33, respectively overtravel or have door-latching co-operation with a corresponding pair of catches or detents M, 52, projecting suitably from the plane of the respective guides A, A, and each having an upper fiat face upon which the free end of the corresponding latchbar 32, 33, impinges for preventing opening movement of the door-sections B, B, unless the handle is first manipulated for withdrawing the latch-bars 32, 33, from latching registration with the detents or keepers M, 42, the latter, it may The detent or keeper 4%, however, is preferably an integral extension of an adjacent vertical sidewall id of a skeleton frame D, which forms a support and partial enclosure for a mechanicalelectrical interlocking apparatus, presently to be described, the wall i l of the frame D having a pair of upper lower ears or lugs 45, 46, respectively, by means of which the frame D is attached suitably to the conjoined legs m and I of the angles M and A, the intervening portion of said legs being cut away and removed, as best seen in Figures 3 and 4.

The frame D includes a second vertical sidewall ll suitably spaced from the wall 44, and upper and lower end or transverse walls 48, 49, respectively, connecting the side-walls d4, 41.

Slidably mounted in and through the side-walls 44, Q1, of the frame D and disposed in endwise registration with the path of movement of the latch-bar 33 over the detent H, is a latch-bolt 50, which, at its end projecting from the framewall 44, is provided with a coupling-head 5| of substantially inverted U-shape.

The coupling-head 5i is adapted for co-operative coupling engagement with a hook or tongue 52 upstanding from the free end of the bar 33,

whereby the bolt 56 is caused to be shifted by and with the bar 33 inwardly through the frame D toward the door B when the bar 33 is withdrawn from superposed registration with the detent 4H for unlatching the door B from closed position and outwardly through the frame D away from the door B when the bar 33 is returned to superposed registration with the detent 41 for latching the door B in closed position.

On its upper face, the bolt St is provided with a notch 53 adapted normally, that is to say, when the bolt 58 is shifted outwardly in the frame D responsive to door-latching movement of the bar 33, into superposed registration with the detent fii, for registration with a mechanical interlocking bar or plunger 56 suitably mounted for vertical movement in the frame D and biased, as by a suitable tensional member in the form preferably of a spring 55, for normally entering into the notch 53 for preventing inward shift- 75 ing movement of the bar and thus, in turn, preventing door-unlatching movement of the latch-bar 33.

At its upper end, the plunger 54 slidably extends through the upper frame-wall 48 and has link connection, as at 56, with the horizontally disposed arm of a bell-crank 51, whose other or vertically disposed arm has adjustably mounted on its free end an arm 58 inclined toward the elevator well 2, as best seen in Figure 10.

In turn, the arm 58 at its free end supports a roller 59 disposed in the path of movement of a cam 66 mounted on the car I, whereby, on arrival of the car I at the landing 4, the cam 60 will engage the roller 59 and swing the bellcrank 51 for lifting the plunger 54 from the notch 53 for. releasing the bolt 50 from the plunger 54.

Pivotally depending from the bolt 56 interiorly of the frame D, is a swingable contact-carrying arm 6|, which at its lower free end carries a conducting switching-member or bridge-piece 62 for co-operative circuit-closing engagement with a pair of paced contacts 63 mounted on and insulated from the frame-wall 4! and connected or included in suitable manner in the circuit (not shown) which supplies motivating current to the elevator hoisting motor (also not shown) for interrupting the supply of current thereto, and preventing motivation thereof whenever the switching-member 62 is disengaged from the contacts 63.

Adjacent its pivoted end, the arm 6| is engaged by one end of a compression member in the form of a coiled spring 64, whose other end bears against the frame-wall 41, the bias of the spring 64 causing the free end of the arm 6| to bear more or less against the frame-wall 44.

Normally, that is to say, when the bolt 56 is in outwardly shifted'door-latching position, the arm 6| takes a diagonal position within the frame D, as best seen in Figures 1, 2, and 4, which is sufficient to cause the switching-member 62 to engage the contacts 63 and preserve the continuity of the elevator motor circuit.

However, as has been said, when the elevator car I arrives at the landing 3, the plunger 54 is released from the bolt 50, and the latter thereupon becomes free to follow the latch-bar 33 as the same, together with its companion bar 32, is shifted inwardly of the door-section B for clearing the respective detents 42, 4|, in preparation for opening movement of the door-sections B, B.

Hence, as the latch-bar 33 is withdrawn from registration with the detent 4|, the clutch-head 5| follows the tongue 52, and the bolt 50 shifts inwardly in like direction until the arm 6 I, biased by the spring 64, takes a position approximately flatwise against the frame-wall 44, as best seen in Figure 3, in which position of the arm 6I, the clutch-head 5|, in following the tongue 52, now stands clear of the detent 4|, and, the latch-bar 33 now also beingclear of the detent 4|, the tongue 52 may freely drop out of engagement with the clutch-head 5| as the door section B moves downwardly toward open position. 7

At the same time, the switching-member 62 is disengaged from the contacts 62, and, the elevator motor circuit being thereby interrupted, movement of the car I is prevented while the bolt 50 is in its described door-released, inwardly shifted position.

Attached to the lower end of the door-suspension rod I2, is a goose-neck arm 65, which has its free end disposed adjacent the frame-wall 41, in

the vertical plane of the bolt 50, the arm 65 sup-' porting a vertical upstanding interference bar 66, which, passing slidably through a guide 61 attached to the frame D, is anchored suitably to the upper end of the rod I2.

Normally, when the door-sections B, B, are in closed position, the arm 65 at its free end, and consequently also the bar 66 at its lower end, are disposed immediately superjacent to the end of the bolt 50, which projects from the frame-wall 41, so that the bolt 50 is free to be shifted outwardly under the arm 65 into door-latching and circuit-closing position.

However, upon initiating opening movement of the door B, the bar 66 drops into registration with the now inwardly shifted end of the bolt 55 and interferes with or prevents the return of the bolt 50 to its normal position until the door-section B is restored to closed position.

In use and operation, it will be seen that the interlock-bolt 56 has two alternative positions. In the normal or initial position thereof, as shown in Figure 2, operation of the elevator car I in the well 2 is permitted by reason of engagement of the switch member 62 with the contacts 63, while operation of the door-sections B, B, from closed position is prevented by reason of the engagement of the plunger 54 in the notch 53 of the bolt 50.

On arrival of the car I at the landing 3, the plunger 54 is disengaged from the notch 53 and the bolt 56 is permissively shiftable from initial position for unlatching the door-sections B, B.

When, for such purpose, the latch-bars 32, 33, are withdrawn from the keepers 42, 4|, respectively, the bolt 50 is, by co-operation of the tongue 52 with the head 5 I shifted to its alternative position, in which position of the bolt 56, the door-sections B, B become permissively operable from closed position, while the car I is prevented from operation in the well 2 by reason of the disengagement of the switch member 62 from the contacts 63.

When the door-sections B, B, are shifted from closed position, the interference bar 66 moves into registration with the bolt 50 for preventing restoration thereof to its initial position until the door-sections B, B, are returned to closed position, as shown in Figure 3.

Furthermore, when the door-sections B, B, are returned to closed position and the bolt 50 becomes permissively operable for restoration to initial position, the co-operation of the tongue 52 with the head 5| compels the restoration of the bars 32, 33, to door-latching position thereof over the keepers 42, 4|, respectively, before the bolt 56 may reassume its initial position for again permitting operation of the elevator car I.

And, finally, when the car I is moved from the landing 3, the plunger 54 reassumes engagement with the notch 53, preventing movement of the bolt 50 from its initial position and thus, in turn, preventing door-unlatching manipulation of the latch-bars 32, 33.

It will be seen that the bolt 50 moves from initial to alternate positions for interlocking the permissive operation of the door-sections B, B, with the permissive operation of the elevator car responsively to motion of the latch-bar 33 from door-latching to door-unlatching positions.

However, the bolt 50 is mounted for shiftable movement laterally in and on the guide A, while the bar 33 is mounted for shiftable movement laterally in and on the door-section B. It hence imperatively follows that the door-section B must have definite and unchanging lateral relation ship with respect to the guide A for co-ordinating the bar 33 'on the door B with the bolt on the guide A for successfully effecting the interlocking functioning ofthe bolt 5|] in the manner and for the purposes described.

Unless such relationship is maintained, many troubles may ensue. For example, if there is side play between the door B and guides A, A, the travel of the bar 33 toward the guide A may be insufficient to return the bolt 50 fully to its initial position, so that the member 62 will fail to re-engage the contacts 63 and thus prevent the operation of the car I, even though the doorsections B, B, be latched in closed position.

Again, as will be readily understood by those skilled in the art, there are some elevator installations wherein a handle, similar to the latchhandle 3!, is mounted on the room-side of the door-section B and is suitably operatively connected to the handle 3| for actuation thereof, in door-opening direction, by a person on the roomside of the door. All so-called push-button elevator installations, for example, are so equipped.

In such an installation, the described definite and unchanging lateral relationship of the door B in the guides A becomes particularly important. Thus, for example, the notch 53 may fail to register with the plunger 54, and the latter, therefore, fail to lock the bolt 50 against movement from initial position even though the switch member 62 is engaging the, contacts 63 for permitting'operation of the car I. Obviously, in such event, the door-sections B, B, could be opened when the car i was away from the landing 3, thus defeating effective functioning of the interlook.

It is, therefore, one of the prime purposes of my invention to provide means for effectively avoiding or eliminating the foregoing difliculties, which is accomplished by the provision of the adjustable shoes C placed on the door-sections B, B, for guiding the same in and between the guides A, A, whereby, when the shoes C have been properly adjusted by shifting the shoe-plate l8 relatively to the plate l5 for suitably forcing, as may be said, the door B toward the guide A, the side play of the door B is substantially eliminated, and the door B will travel vertically in horizontally aligned position with respect to the guide A.

After the shoes C have been thus adjusted and permanently set and locked, it is then possible to, with confidence, precisely and minutely adjust the travel of the bar 33 by manipulating the screw-stop 39, so that, when the tongue 52 is in engagement with the head 5!, and the bar 33 is extended from the door B to its proper limit, both the switch member 62 will make positive electrical contact with the contacts fi3fand the plunger 54 will make positive bolt-locking engagement with the notch 53.

However, it is to be emphasized that, as time goes on, constant wear and tear of the shoes C will obviously occur to such an extent that undesirable side play of the door B in its guides A is more than can be taken up either by adjusting the shoes C on the door B by shifting the plate l8 relatively to the plate l5, or by adjusting the travel of the latch-bar 33 on the door B by manipulation of the stop 39, as before described.

Heretofore, so far as I am aware, when the guide-shoes on elevator-doors wear to such an extent as to require replacement, it has been necessary to take down the elevator-door, re-' move the worn shoe, replace it with a new shoe, and then reinstall the door, all of which compels the closing-down of the elevator, entails a great deal of expense and time, and deprives the'occupant of the building of the use of the elevator.

These troubles are completely eliminated in and by the present structure by reason of the fact that the shoe-plate I8 is not only adjustable relatively to the plate IE, but also may with ease and dispatch be detached from the plate I5 by merely removing the bolt 23, and these operations may be performed from the well-side of the door B without disturbing the door itself.

In practice, the several parts of the shoe C are made fully interchangeable, so that a new shoeplate l8 may be exchanged for the worn one, and, when the new plate I8 is installed, the door B is again in its proper position, and all this may be done with minmum time and expense and with virtually no interruption to the elevator service.

It may be reiterated that it is impossible, by reason of the co-action of the interference bar 66 with the bolt 50, to manually restore the bolt 50 to initial position when the door-sections B, B, are open, and it will be readily apparent that the objects of my invention are thus efficiently accomplished by the combination and co-ordination of the several parts of the mechanism as described, more particularly, it may be pointed out, with respect to the adjustment of the movement of the latch-bar 33, the adjustment and renewability of the shoes C on the door B, and the several interlocking members as the plunger 54,

the contact-arm 6|, and the interference bar 66, all of which co-operates, as I have set forth, for providing a protection to the landing 3, which is absolutely safe, positive, and fool-proof against accidents, and I might add that such complete protection is, so far as I am aware, practically wholly unobtainable Without the desired co-operation of the several parts mentioned.

It will be understood that changes and modifications in the form, construction, arrangement and combination of the several parts of the door and interlock structure may be made and substituted for those herein shown and described without departing from the nature and principle of my invention.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. In combination with an elevator-well having a landing, a car arranged for travel vertically in the well, and a door shiftable vertically with respect to the well for protecting the landing, means including a keeper on the Wall of the well and a bar shiftable on the door transversely with respect to the well for engagement normally during travel of the car with the keeper for latching the door in closed position, a bolt arranged on the wall of the well for movement on a line parallel with the line of movement of the latch-bar and engageable with the bar when the latter is in normal position, means for securing the bolt against movement for normally preventing movement of the latch-bar to door-opening position, and means operably responsive to position of the elevator at the landing for effecting release of the bolt for enabling movement of the latch-bar to door-opening position.

2. In combination with an elevator-well having a landing, a car arranged for travel vertically in the well, and a door shiftable vertically with respect to the Well for protecting the landing,

means including a keeper on the wall of the well and a bar shiftable on the door transversely with respect to the well for engagement normally during travel of the car with the keeper for latching the door in closed position, means comprising a bolt arranged on the wall of the well for endwise shiftable movement on a line parallel with the line of movement of the latch-bar and engageable with the latch-bar when the latter is in normal position and a plunger mounted on the well for movement at right angles to the bolt for normally engaging the bolt for preventing movement of the latch-bar to dooropening position, and means operably responsive to position of the elevator at the landing for disengaging the plunger from the bolt for enabling movement of the latch-bar to dooropening position.

3. In combination with an elevator-well having a landing, a car arranged for travel vertically in the well, and a door shiftable vertically with respect to the well for protecting the landing, means-including a keeper on the wall of the well and a bar shiftable on the door transversely with respect to the well for engagement normally during travel of the car with the keeper for latching the door in closed position, means comprising a marginally notched bolt arranged on the wall of the well for endwise shiftable movement on a line parallel with the line of movement of the latch-bar and hookwise engageable with the latch-bar when the latch-bar is in normal position and a spring-pressed plunger mounted for movement on the wall of the well at right angles to the bolt for engagement with the bolt at its notch for normally preventing movement of the latchbar to door-opening position, and means responsive to elevator position at the landing for disengaging the plunger from the bolt for enabling movement of the latch-bar to door-opening position, the latch-bar moving away from the bolt on opening movement of the door.

i. In combination with an elevator-well having a landing, a car arranged for travel vertically in the Well, actuating mechanism for the car including an electric circuit, and a door shiftable vertically with respect to the well for protecting the landing, means comprising a bar shiftable on the door transversely with respect to the well for normally during travel of the car releasably latching the door in closed position, a bolt arranged on the wall of the well for movement on a line parallel with the line of movement of the bar and hookwise engageable with the bar when the latter is in normal position, means for releasably securing the bolt against movement for normally preventing movement of the bar to door-opening position, means operably responsive to position of the elevator at the landing for effecting release of the bolt for enabling movement of the latchbar to door-opening position, the bolt being shiftable upon movement of the latch-bar to dooropening position, means responsive to movement of the bolt to door-opening position for interrupting the circuit for preventing car-operation when the bar is in door-opening position, and means responsive to door position for preventing restoration of the bolt to normal position while the door is open.

5. In combination with an elevator-Well having a landing, a car arranged for travel vertically in the well, and a door shiftable vertically with respect to the well for protecting the landing, guides on the wall of the well for the door, one of said guides being interrupted, means including opposed keepers on the guides and a bar shiftable on the door transversely with respect to the well for engagement normally during travel of the car with the keepers for latching the door in closed position, a frame on said one guide at the interruption therein, means comprising a notched bolt mounted for slidable movement on said frame transversely of the well for hookwise engagement with the latch-bar and a spring pressed plunger also mounted for movement on said frame vertically of the well for endwise engagement with the bolt at its notch for normally preventing movement of the latch-bar to door-opening position, and means responsive to elevator position at the landing for disengaging the plunger from the bolt for enabling movement of the latchbar to door-opening position, the latch-bar moving away from the bolt on opening movement of the door.

6. In combination with an elevator-well having a landing, a car arranged for travel vertically in the well, a door shiftable vertically of the well for protecting the landing, and guides for the door fixed on the wall of the well, means including a bar shiftable on the door transversely of the well for normally during travel of the car latching the door in closed position, means comprising a bolt mounted on one of the guides for detachable engagement with the bar for movement transversely of the Well by and with the bar for preventively interlocking the operation of the car with permissive operation of the door, and means for adjustably maintaining vertical alignment of the door relatively to the guides for co-operative interlocking engagement between the bar and bolt.

'7. In combination with an elevator-well having a landing, a car arranged for travel in the well, a shiftable door for protecting the landing, and guides for the door fixed on the wall of the well, means including a bar shiftable on the door for normally during travel of the car latching the door in closed position, means comprising a bolt mounted on one of the guides for detachable engagement with the bar for movement by and with the bar for preventively interlocking the operation of the car with permissive operation of the door, and means for adjustably maintaining alignment of the door relatively to the guides for co-operative interlocking engagement between the bar and bolt, said last named means including a shoe comprising a first member fixed on the door and engaging a guide, a second member for opposingly engaging the guide, and elements for adjustably securing the second member to the first member.

8. In combination with an elevator-well haviiig a landing, a car arranged for travel in the well, a shiftable door for protecting the landing, and guides for the door fixed on the wall of the well, means including a bar shiftable on the door for normally during travel of the car latching the door in closed position, means comprising a bolt mounted on one of the guides for detachable engagement with the bar for movement by and with the bar for preventively interlocking the operation of the car with permissive operation of the door, and means for adjustably maintaining alignment of the door relatively to the guides for co-operative interlocking engagement between the bar and bolt, said means including a shoe comprising a first member fixed on the door and engaging a side of a guide, a shouldered second member for engaging both the margin and the opposite side of the guide, and elements for adjustably securing the second member to the first member.

9. The combination with an elevator-door and its guide, of a guide-engaging shoe comprising a pair of separable plates for disposition upon opposite sides of the guide, and means for securing the shoe to the door in fixed relation thereto and the plates together for guide-engagement.

10. The combination with an elevator-door and its guide, of a guide-engaging shoe comprising first and second separable plates spaced for disposition upon opposite sides of the guide, means for securing the first plate to the door, and means for securing the second plate to the first plate in a predetermined fixed relation thereto.

11. The combination with an elevator-door and its guide, of a guide-engaging shoe including first and second separable plates spaced for disposition upon opposite sides of the guide, lateral projections on the first plate for securement thereof on the door, and means for adjustably securing the second plate to the first plate.

12. The combination with an elevator-door and its guide, of a guide-engaging shoe including first and second separable plates spaced for disposition upon opposite sides of the guide, the second plate being slotted, lateral projections on the first plate for securement thereof on the door, and means comprising a bolt projecting through said slot and engaging the first plate for securing the plates adjustably together.

13. The combination with an elevator-door and its guide, of a guide-engaging shoe comprising first and second separable plates spaced for disposition upon opposite sides of the guide, lateral flanges on the first plate for securement thereof upon the door, the second plate being slotted and having a shoulder for engaging a margin of the guide, means comprising a bolt projecting through said slot and engaging the first plate for securing said plates operatively together, and means for shifting the second plate relatively to the first plate for marginally spacing said shoulder from the door. I

14. In combination with an elevator-well having a landing, a car arranged for travel in the well, a shiftable door for protecting the landing, and guides for the door fixed on the wall of the well, means including opposed keepers fixed on the guides and a bar pivoted on the door for shiftable movement transversely of the door for engagement normally during travel of the car with the keepers for latching the door in closed position, and means for adjustably regulating the movement of the bar for co-operative engagement with the keepers.

15. In combination with an elevator-well having a landing, a car arranged for travel vertically in the well, and a door shiitable vertically of the well for protecting the landing, means including a keeper on the wall of the well and a bar shiftable on the door transversely of the Well forengagement normally during travel of the car with the keeper for latching the door in closed position, means comprising a shiftable bolt constructed for detachable bar engagement for normally preventing movement of the latch-bar to door-opening position, the bar and bolt being shiftable in a direction to permit opening movement of the door, counter-weight means operably associated with the door, and means actuable by the counter-weight means for preventing retrograde movement of the bolt when the door is in open position.

16. An elevator-door mechanism comprising a plurality of guide members mountable in operable juxtaposition to a door-opening, a doormember shiftable within said guides, a lengthwise shiftable latching-bar mounted on the door,

a lock-housing mounted in fixed juxtaposition to the guides, detent means operably disposed in the lock-housing for engagement with the latchingbar, said detent means being restricted to longi tudinal movement in a path transverse to the path of movement of the door under actuation by the latching-bar, said latching-bar and said detent means being mutually restricted to disengagement in a path parallel to the path of movement of the door, counter-Weight means operably associated with the door, and slide means mounted for longitudinal movement with respect to the guide means, said slide means being actuable by the counter-weight means and being selectively engageable with the detent means for directly preventing retrograde movement of the detent means when the door is in open position.

HERMAN C. WALDMAN. 

